PNAE G-7-030-91 PDF

Full title and description

PNAE G-7-030-91 — "Unified methods of control of base materials (semi‑finished products), welded joints and claddings of equipment and pipelines of nuclear power installations. Ultrasonic testing. Part II: Testing of welded joints and claddings." This document sets out detailed ultrasonic testing methods, procedures and requirements for examination of welds and weld claddings used in nuclear power plant equipment and piping.

Abstract

This PNAE part provides standardized ultrasonic inspection procedures for quality assessment of welded joints and claddings in nuclear‑industry equipment and pipelines. It defines applicable techniques (direct and angled beam methods), transducer selection and positioning, scanning schemes, calibration and reference blocks, measurement and evaluation of indications, and documentation requirements to ensure repeatable, auditable ultrasonic testing for safety‑critical components.

General information

• Status: Withdrawn / no longer in force (document removed from force by order of the supervisory authority; formally made obsolete by Rostekhnadzor action in 2018).
• Publication date: Approved 31 October 1991; introduced into effect 1 October 1992 (published in 1992 by ЦНИИатоминформ / Atominform).
• Publisher: ЦНИИатоминформ (Central Atomic Information Research Institute / Atominform), Moscow — published 1992.
• ICS / categories: Nuclear engineering / non‑destructive testing; technical regulations and inspection methods for equipment and pipelines of nuclear power installations (classified within PNAE G — quality and control rules for atomic energy installations).
• Edition / version: Original designation PNAE G-7-030-91 (Part II of the ultrasonic testing series).
• Number of pages: Approximately 92 pages (typical published edition).

Scope

The standard applies to ultrasonic quality control of welded joints and claddings used in equipment and pipelines covered by the PNAE rules for nuclear power installations. It is intended for use where PNAE G‑7 series control rules are applicable and was originally mandatory for organizations involved in design, manufacture, installation, operation and repair of nuclear plant equipment and piping. The part covers methods, parametrization (frequencies, angles), scanning schemes, evaluation criteria and required records for UT of welds and claddings.

Key topics and requirements

• Specified ultrasonic testing techniques for welds and claddings: direct beam, single‑reflection (one‑time reflected) and angled beam schemes.
• Selection of transducer types, nominal frequencies and input angles by weld thickness and geometry.
• Calibration procedures, use of standard test blocks and amplitude/attenuation measurement methods.
• Scanning patterns, sector/linear scans and recommendations for coverage & accessible zones.
• Criteria for measurement and evaluation of indications (amplitude, equivalent size, position, orientation) and acceptance rules for discontinuities.
• Requirements for documentation: control maps, technologic process records, calibration logs and traceable inspection reports.
• Provisions for inspection of claddings (overlay welds) and special cases (thin walls, nozzles, internal machined surfaces).

Typical use and users

Primary users are nuclear industry nondestructive testing (NDT) engineers, inspection and quality assurance personnel, plant constructors, fabrication shops producing nuclear‑grade welded assemblies, and regulators or technical reviewers in charge of nuclear‑equipment conformity. The document is also referenced by NDT trainers and organisations implementing ultrasonic procedures for safety‑critical piping and pressure‑retaining components.

Related standards

Belongs to the PNAE G‑7 series of unified control methodologies (other parts cover radiographic, magnetic particle, visual/measurement control, leak testing, etc.). It is linked to higher‑level PNAE rules for equipment and pipelines (for example PNAE G‑7‑008‑89 and PNAE G‑7‑010‑89) which define applicability and general control requirements. Over time, many PNAE documents have been superseded or integrated into newer regulatory acts issued by Russian supervisory authorities.

Keywords

PNAE G-7-030-91, ultrasonic testing, UT, welded joints, cladding, weld inspection, nuclear power, non‑destructive testing, calibration, acceptance criteria, inspection procedures.

FAQ

Q: What is this standard?

A: PNAE G-7-030-91 is Part II of a PNAE series establishing unified ultrasonic testing methods for base materials, welded joints and claddings used in equipment and pipelines of nuclear power installations.

Q: What does it cover?

A: It covers ultrasonic examination techniques and procedures specifically for welded joints and overlay claddings — including transducer selection, scanning schemes, calibration, evaluation of indications and required documentation for inspections.

Q: Who typically uses it?

A: Nondestructive testing engineers and inspectors in the nuclear industry, fabrication and repair shops working to nuclear quality requirements, QA/QC departments, and technical regulators or reviewers.

Q: Is it current or superseded?

A: The original PNAE G-7-030-91 was approved in 1991 and introduced in 1992; it was later removed from force (formally made obsolete by supervisory authority actions in 2018). Users should verify current applicable national/regulatory documents and any successor normative acts before relying on it for current regulatory compliance.

Q: Is it part of a series?

A: Yes — it is part of the PNAE G‑7 family of unified control methodologies (multiple parts cover different NDT methods and materials control for nuclear installations).

Q: What are the key keywords?

A: Ultrasonic testing, weld inspection, cladding inspection, PNAE, nuclear equipment, nondestructive testing, calibration, acceptance criteria, transducer selection, scanning schemes.